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                    模块
            
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<p>&#x4E00;&#x4E2A;&#x6A21;&#x5757;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x72EC;&#x7ACB;&#x7684;&#x6587;&#x4EF6;&#x3002;&#x8BE5;&#x6587;&#x4EF6;&#x5185;&#x90E8;&#x7684;&#x6240;&#x6709;&#x53D8;&#x91CF;&#xFF0C;&#x5916;&#x90E8;&#x65E0;&#x6CD5;&#x83B7;&#x53D6;&#x3002;&#x5982;&#x679C;&#x4F60;&#x5E0C;&#x671B;&#x5916;&#x90E8;&#x80FD;&#x591F;&#x8BFB;&#x53D6;&#x6A21;&#x5757;&#x5185;&#x90E8;&#x7684;&#x67D0;&#x4E2A;&#x53D8;&#x91CF;&#xFF0C;&#x5C31;&#x5FC5;&#x987B;&#x4F7F;&#x7528;<code>export</code>&#x5173;&#x952E;&#x5B57;&#x8F93;&#x51FA;&#x8BE5;&#x53D8;&#x91CF;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A; JS &#x6587;&#x4EF6;&#xFF0C;&#x91CC;&#x9762;&#x4F7F;&#x7528;<code>export</code>&#x547D;&#x4EE4;&#x8F93;&#x51FA;&#x53D8;&#x91CF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// profile.js</span>
<span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> firstName = <span class="hljs-string">&apos;Michael&apos;</span>;
<span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> lastName = <span class="hljs-string">&apos;Jackson&apos;</span>;
<span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> year = <span class="hljs-number">1958</span>;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x662F;<code>profile.js</code>&#x6587;&#x4EF6;&#xFF0C;&#x4FDD;&#x5B58;&#x4E86;&#x7528;&#x6237;&#x4FE1;&#x606F;&#x3002;ES6 &#x5C06;&#x5176;&#x89C6;&#x4E3A;&#x4E00;&#x4E2A;&#x6A21;&#x5757;&#xFF0C;&#x91CC;&#x9762;&#x7528;<code>export</code>&#x547D;&#x4EE4;&#x5BF9;&#x5916;&#x90E8;&#x8F93;&#x51FA;&#x4E86;&#x4E09;&#x4E2A;&#x53D8;&#x91CF;&#x3002;</p>
<p><code>export</code>&#x7684;&#x5199;&#x6CD5;&#xFF0C;&#x9664;&#x4E86;&#x50CF;&#x4E0A;&#x9762;&#x8FD9;&#x6837;&#xFF0C;&#x8FD8;&#x6709;&#x53E6;&#x5916;&#x4E00;&#x79CD;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// profile.js</span>
<span class="hljs-keyword">var</span> firstName = <span class="hljs-string">&apos;Michael&apos;</span>;
<span class="hljs-keyword">var</span> lastName = <span class="hljs-string">&apos;Jackson&apos;</span>;
<span class="hljs-keyword">var</span> year = <span class="hljs-number">1958</span>;

<span class="hljs-keyword">export</span> { firstName, lastName, year };
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5728;<code>export</code>&#x547D;&#x4EE4;&#x540E;&#x9762;&#xFF0C;&#x4F7F;&#x7528;&#x5927;&#x62EC;&#x53F7;&#x6307;&#x5B9A;&#x6240;&#x8981;&#x8F93;&#x51FA;&#x7684;&#x4E00;&#x7EC4;&#x53D8;&#x91CF;&#x3002;&#x5B83;&#x4E0E;&#x524D;&#x4E00;&#x79CD;&#x5199;&#x6CD5;&#xFF08;&#x76F4;&#x63A5;&#x653E;&#x7F6E;&#x5728;<code>var</code>&#x8BED;&#x53E5;&#x524D;&#xFF09;&#x662F;&#x7B49;&#x4EF7;&#x7684;&#xFF0C;&#x4F46;&#x662F;&#x5E94;&#x8BE5;&#x4F18;&#x5148;&#x8003;&#x8651;&#x4F7F;&#x7528;&#x8FD9;&#x79CD;&#x5199;&#x6CD5;&#x3002;&#x56E0;&#x4E3A;&#x8FD9;&#x6837;&#x5C31;&#x53EF;&#x4EE5;&#x5728;&#x811A;&#x672C;&#x5C3E;&#x90E8;&#xFF0C;&#x4E00;&#x773C;&#x770B;&#x6E05;&#x695A;&#x8F93;&#x51FA;&#x4E86;&#x54EA;&#x4E9B;&#x53D8;&#x91CF;&#x3002;</p>
<p><code>export</code>&#x547D;&#x4EE4;&#x9664;&#x4E86;&#x8F93;&#x51FA;&#x53D8;&#x91CF;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x8F93;&#x51FA;&#x51FD;&#x6570;&#x6216;&#x7C7B;&#xFF08;class&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">multiply</span>(<span class="hljs-params">x, y</span>) </span>{
  <span class="hljs-keyword">return</span> x * y;
};
</code></pre>
<p>&#x901A;&#x5E38;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;<code>export</code>&#x8F93;&#x51FA;&#x7684;&#x53D8;&#x91CF;&#x5C31;&#x662F;&#x672C;&#x6765;&#x7684;&#x540D;&#x5B57;&#xFF0C;&#x4F46;&#x662F;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>as</code>&#x5173;&#x952E;&#x5B57;&#x91CD;&#x547D;&#x540D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">v1</span>(<span class="hljs-params"></span>) </span>{ ... }
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">v2</span>(<span class="hljs-params"></span>) </span>{ ... }

<span class="hljs-keyword">export</span> {
  v1 <span class="hljs-keyword">as</span> streamV1,
  v2 <span class="hljs-keyword">as</span> streamV2,
  v2 <span class="hljs-keyword">as</span> streamLatestVersion
};
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4F7F;&#x7528;<code>as</code>&#x5173;&#x952E;&#x5B57;&#xFF0C;&#x91CD;&#x547D;&#x540D;&#x4E86;&#x51FD;&#x6570;<code>v1</code>&#x548C;<code>v2</code>&#x7684;&#x5BF9;&#x5916;&#x63A5;&#x53E3;&#x3002;&#x91CD;&#x547D;&#x540D;&#x540E;&#xFF0C;<code>v2</code>&#x53EF;&#x4EE5;&#x7528;&#x4E0D;&#x540C;&#x7684;&#x540D;&#x5B57;&#x8F93;&#x51FA;&#x4E24;&#x6B21;&#x3002;</p>
<p>&#x9700;&#x8981;&#x7279;&#x522B;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;<code>export</code>&#x547D;&#x4EE4;&#x89C4;&#x5B9A;&#x7684;&#x662F;&#x5BF9;&#x5916;&#x7684;&#x63A5;&#x53E3;&#xFF0C;&#x5FC5;&#x987B;&#x4E0E;&#x6A21;&#x5757;&#x5185;&#x90E8;&#x7684;&#x53D8;&#x91CF;&#x5EFA;&#x7ACB;&#x4E00;&#x4E00;&#x5BF9;&#x5E94;&#x5173;&#x7CFB;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-keyword">export</span> <span class="hljs-number">1</span>;

<span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-keyword">var</span> m = <span class="hljs-number">1</span>;
<span class="hljs-keyword">export</span> m;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4E24;&#x79CD;&#x5199;&#x6CD5;&#x90FD;&#x4F1A;&#x62A5;&#x9519;&#xFF0C;&#x56E0;&#x4E3A;&#x6CA1;&#x6709;&#x63D0;&#x4F9B;&#x5BF9;&#x5916;&#x7684;&#x63A5;&#x53E3;&#x3002;&#x7B2C;&#x4E00;&#x79CD;&#x5199;&#x6CD5;&#x76F4;&#x63A5;&#x8F93;&#x51FA; 1&#xFF0C;&#x7B2C;&#x4E8C;&#x79CD;&#x5199;&#x6CD5;&#x901A;&#x8FC7;&#x53D8;&#x91CF;<code>m</code>&#xFF0C;&#x8FD8;&#x662F;&#x76F4;&#x63A5;&#x8F93;&#x51FA; 1&#x3002;<code>1</code>&#x53EA;&#x662F;&#x4E00;&#x4E2A;&#x503C;&#xFF0C;&#x4E0D;&#x662F;&#x63A5;&#x53E3;&#x3002;</p>
<p>&#x540C;&#x6837;&#x7684;&#xFF0C;<code>function</code>&#x548C;<code>class</code>&#x7684;&#x8F93;&#x51FA;&#xFF0C;&#x4E5F;&#x5FC5;&#x987B;&#x9075;&#x5B88;&#x8FD9;&#x6837;&#x7684;&#x5199;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params"></span>) </span>{}
<span class="hljs-keyword">export</span> f;

<span class="hljs-comment">// &#x6B63;&#x786E;</span>
<span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params"></span>) </span>{};

<span class="hljs-comment">// &#x6B63;&#x786E;</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params"></span>) </span>{}
<span class="hljs-keyword">export</span> {f};
</code></pre>
<h3 id="import">import</h3>
<p>&#x4F7F;&#x7528;<code>export</code>&#x547D;&#x4EE4;&#x5B9A;&#x4E49;&#x4E86;&#x6A21;&#x5757;&#x7684;&#x5BF9;&#x5916;&#x63A5;&#x53E3;&#x4EE5;&#x540E;&#xFF0C;&#x5176;&#x4ED6; JS &#x6587;&#x4EF6;&#x5C31;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>import</code>&#x547D;&#x4EE4;&#x52A0;&#x8F7D;&#x8FD9;&#x4E2A;&#x6A21;&#x5757;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// main.js</span>
<span class="hljs-keyword">import</span> { firstName, lastName, year } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./profile.js&apos;</span>;

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">setName</span>(<span class="hljs-params">element</span>) </span>{
  element.textContent = firstName + <span class="hljs-string">&apos; &apos;</span> + lastName;
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;<code>import</code>&#x547D;&#x4EE4;&#xFF0C;&#x7528;&#x4E8E;&#x52A0;&#x8F7D;<code>profile.js</code>&#x6587;&#x4EF6;&#xFF0C;&#x5E76;&#x4ECE;&#x4E2D;&#x8F93;&#x5165;&#x53D8;&#x91CF;&#x3002;<code>import</code>&#x547D;&#x4EE4;&#x63A5;&#x53D7;&#x4E00;&#x5BF9;&#x5927;&#x62EC;&#x53F7;&#xFF0C;&#x91CC;&#x9762;&#x6307;&#x5B9A;&#x8981;&#x4ECE;&#x5176;&#x4ED6;&#x6A21;&#x5757;&#x5BFC;&#x5165;&#x7684;&#x53D8;&#x91CF;&#x540D;&#x3002;&#x5927;&#x62EC;&#x53F7;&#x91CC;&#x9762;&#x7684;&#x53D8;&#x91CF;&#x540D;&#xFF0C;&#x5FC5;&#x987B;&#x4E0E;&#x88AB;&#x5BFC;&#x5165;&#x6A21;&#x5757;&#xFF08;<code>profile.js</code>&#xFF09;&#x5BF9;&#x5916;&#x63A5;&#x53E3;&#x7684;&#x540D;&#x79F0;&#x76F8;&#x540C;&#x3002;</p>
<p>&#x5982;&#x679C;&#x60F3;&#x4E3A;&#x8F93;&#x5165;&#x7684;&#x53D8;&#x91CF;&#x91CD;&#x65B0;&#x53D6;&#x4E00;&#x4E2A;&#x540D;&#x5B57;&#xFF0C;<code>import</code>&#x547D;&#x4EE4;&#x8981;&#x4F7F;&#x7528;<code>as</code>&#x5173;&#x952E;&#x5B57;&#xFF0C;&#x5C06;&#x8F93;&#x5165;&#x7684;&#x53D8;&#x91CF;&#x91CD;&#x547D;&#x540D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> { lastName <span class="hljs-keyword">as</span> surname } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./profile.js&apos;</span>;
</code></pre>
<p><code>import</code>&#x547D;&#x4EE4;&#x8F93;&#x5165;&#x7684;&#x53D8;&#x91CF;&#x90FD;&#x662F;&#x53EA;&#x8BFB;&#x7684;&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x7684;&#x672C;&#x8D28;&#x662F;&#x8F93;&#x5165;&#x63A5;&#x53E3;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x4E0D;&#x5141;&#x8BB8;&#x5728;&#x52A0;&#x8F7D;&#x6A21;&#x5757;&#x7684;&#x811A;&#x672C;&#x91CC;&#x9762;&#xFF0C;&#x6539;&#x5199;&#x63A5;&#x53E3;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> {a} <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./xxx.js&apos;</span>

a = {}; <span class="hljs-comment">// Syntax Error : &apos;a&apos; is read-only;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x811A;&#x672C;&#x52A0;&#x8F7D;&#x4E86;&#x53D8;&#x91CF;<code>a</code>&#xFF0C;&#x5BF9;&#x5176;&#x91CD;&#x65B0;&#x8D4B;&#x503C;&#x5C31;&#x4F1A;&#x62A5;&#x9519;&#xFF0C;&#x56E0;&#x4E3A;<code>a</code>&#x662F;&#x4E00;&#x4E2A;&#x53EA;&#x8BFB;&#x7684;&#x63A5;&#x53E3;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x5982;&#x679C;<code>a</code>&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x6539;&#x5199;<code>a</code>&#x7684;&#x5C5E;&#x6027;&#x662F;&#x5141;&#x8BB8;&#x7684;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> {a} <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./xxx.js&apos;</span>

a.foo = <span class="hljs-string">&apos;hello&apos;</span>; <span class="hljs-comment">// &#x5408;&#x6CD5;&#x64CD;&#x4F5C;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>a</code>&#x7684;&#x5C5E;&#x6027;&#x53EF;&#x4EE5;&#x6210;&#x529F;&#x6539;&#x5199;&#xFF0C;&#x5E76;&#x4E14;&#x5176;&#x4ED6;&#x6A21;&#x5757;&#x4E5F;&#x53EF;&#x4EE5;&#x8BFB;&#x5230;&#x6539;&#x5199;&#x540E;&#x7684;&#x503C;&#x3002;&#x4E0D;&#x8FC7;&#xFF0C;&#x8FD9;&#x79CD;&#x5199;&#x6CD5;&#x5F88;&#x96BE;&#x67E5;&#x9519;&#xFF0C;&#x5EFA;&#x8BAE;&#x51E1;&#x662F;&#x8F93;&#x5165;&#x7684;&#x53D8;&#x91CF;&#xFF0C;&#x90FD;&#x5F53;&#x4F5C;&#x5B8C;&#x5168;&#x53EA;&#x8BFB;&#xFF0C;&#x4E0D;&#x8981;&#x8F7B;&#x6613;&#x6539;&#x53D8;&#x5B83;&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<p><code>import</code>&#x540E;&#x9762;&#x7684;<code>from</code>&#x6307;&#x5B9A;&#x6A21;&#x5757;&#x6587;&#x4EF6;&#x7684;&#x4F4D;&#x7F6E;&#xFF0C;&#x53EF;&#x4EE5;&#x662F;&#x76F8;&#x5BF9;&#x8DEF;&#x5F84;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;&#x7EDD;&#x5BF9;&#x8DEF;&#x5F84;&#xFF0C;<code>.js</code>&#x540E;&#x7F00;&#x53EF;&#x4EE5;&#x7701;&#x7565;&#x3002;&#x5982;&#x679C;&#x53EA;&#x662F;&#x6A21;&#x5757;&#x540D;&#xFF0C;&#x4E0D;&#x5E26;&#x6709;&#x8DEF;&#x5F84;&#xFF0C;&#x90A3;&#x4E48;&#x5FC5;&#x987B;&#x6709;&#x914D;&#x7F6E;&#x6587;&#x4EF6;&#xFF0C;&#x544A;&#x8BC9; JavaScript &#x5F15;&#x64CE;&#x8BE5;&#x6A21;&#x5757;&#x7684;&#x4F4D;&#x7F6E;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> {myMethod} <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;util&apos;</span>;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>util</code>&#x662F;&#x6A21;&#x5757;&#x6587;&#x4EF6;&#x540D;&#xFF0C;&#x7531;&#x4E8E;&#x4E0D;&#x5E26;&#x6709;&#x8DEF;&#x5F84;&#xFF0C;&#x5FC5;&#x987B;&#x901A;&#x8FC7;&#x914D;&#x7F6E;&#xFF0C;&#x544A;&#x8BC9;&#x5F15;&#x64CE;&#x600E;&#x4E48;&#x53D6;&#x5230;&#x8FD9;&#x4E2A;&#x6A21;&#x5757;&#x3002;</p>
<p><font color="red">&#x6CE8;&#x610F;</font>&#xFF0C;<code>import</code>&#x547D;&#x4EE4;&#x5177;&#x6709;&#x63D0;&#x5347;&#x6548;&#x679C;&#xFF0C;&#x4F1A;&#x63D0;&#x5347;&#x5230;&#x6574;&#x4E2A;&#x6A21;&#x5757;&#x7684;&#x5934;&#x90E8;&#xFF0C;&#x9996;&#x5148;&#x6267;&#x884C;&#x3002;</p>
<pre><code class="lang-javascript">foo();

<span class="hljs-keyword">import</span> { foo } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;my_module&apos;</span>;
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x4E0D;&#x4F1A;&#x62A5;&#x9519;&#xFF0C;&#x56E0;&#x4E3A;<code>import</code>&#x7684;&#x6267;&#x884C;&#x65E9;&#x4E8E;<code>foo</code>&#x7684;&#x8C03;&#x7528;&#x3002;&#x8FD9;&#x79CD;&#x884C;&#x4E3A;&#x7684;&#x672C;&#x8D28;&#x662F;&#xFF0C;<code>import</code>&#x547D;&#x4EE4;&#x662F;&#x7F16;&#x8BD1;&#x9636;&#x6BB5;&#x6267;&#x884C;&#x7684;&#xFF0C;&#x5728;&#x4EE3;&#x7801;&#x8FD0;&#x884C;&#x4E4B;&#x524D;&#x3002;</p>
<p>&#x7531;&#x4E8E;<code>import</code>&#x662F;&#x9759;&#x6001;&#x6267;&#x884C;&#xFF0C;&#x6240;&#x4EE5;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x8868;&#x8FBE;&#x5F0F;&#x548C;&#x53D8;&#x91CF;&#xFF0C;&#x8FD9;&#x4E9B;&#x53EA;&#x6709;&#x5728;&#x8FD0;&#x884C;&#x65F6;&#x624D;&#x80FD;&#x5F97;&#x5230;&#x7ED3;&#x679C;&#x7684;&#x8BED;&#x6CD5;&#x7ED3;&#x6784;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-keyword">import</span> { <span class="hljs-string">&apos;f&apos;</span> + <span class="hljs-string">&apos;oo&apos;</span> } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;my_module&apos;</span>;

<span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-keyword">let</span> <span class="hljs-built_in">module</span> = <span class="hljs-string">&apos;my_module&apos;</span>;
<span class="hljs-keyword">import</span> { foo } <span class="hljs-keyword">from</span> <span class="hljs-built_in">module</span>;

<span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-keyword">if</span> (x === <span class="hljs-number">1</span>) {
  <span class="hljs-keyword">import</span> { foo } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;module1&apos;</span>;
} <span class="hljs-keyword">else</span> {
  <span class="hljs-keyword">import</span> { foo } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;module2&apos;</span>;
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4E09;&#x79CD;&#x5199;&#x6CD5;&#x90FD;&#x4F1A;&#x62A5;&#x9519;&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x4EEC;&#x7528;&#x5230;&#x4E86;&#x8868;&#x8FBE;&#x5F0F;&#x3001;&#x53D8;&#x91CF;&#x548C;<code>if</code>&#x7ED3;&#x6784;&#x3002;&#x5728;&#x9759;&#x6001;&#x5206;&#x6790;&#x9636;&#x6BB5;&#xFF0C;&#x8FD9;&#x4E9B;&#x8BED;&#x6CD5;&#x90FD;&#x662F;&#x6CA1;&#x6CD5;&#x5F97;&#x5230;&#x503C;&#x7684;&#x3002;</p>
<p>&#x5982;&#x679C;&#x591A;&#x6B21;&#x91CD;&#x590D;&#x6267;&#x884C;&#x540C;&#x4E00;&#x53E5;<code>import</code>&#x8BED;&#x53E5;&#xFF0C;&#x90A3;&#x4E48;&#x53EA;&#x4F1A;&#x6267;&#x884C;&#x4E00;&#x6B21;&#xFF0C;&#x800C;&#x4E0D;&#x4F1A;&#x6267;&#x884C;&#x591A;&#x6B21;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> <span class="hljs-string">&apos;lodash&apos;</span>;
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;lodash&apos;</span>;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x52A0;&#x8F7D;&#x4E86;&#x4E24;&#x6B21;<code>lodash</code>&#xFF0C;&#x4F46;&#x662F;&#x53EA;&#x4F1A;&#x6267;&#x884C;&#x4E00;&#x6B21;&#x3002;</p>
<h3 id="&#x6A21;&#x5757;&#x7684;&#x6574;&#x4F53;&#x52A0;&#x8F7D;">&#x6A21;&#x5757;&#x7684;&#x6574;&#x4F53;&#x52A0;&#x8F7D;</h3>
<p>&#x9664;&#x4E86;&#x6307;&#x5B9A;&#x52A0;&#x8F7D;&#x67D0;&#x4E2A;&#x8F93;&#x51FA;&#x503C;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x6574;&#x4F53;&#x52A0;&#x8F7D;&#xFF0C;&#x5373;&#x7528;&#x661F;&#x53F7;&#xFF08;<code>*</code>&#xFF09;&#x6307;&#x5B9A;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x6240;&#x6709;&#x8F93;&#x51FA;&#x503C;&#x90FD;&#x52A0;&#x8F7D;&#x5728;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x4E0A;&#x9762;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;<code>circle.js</code>&#x6587;&#x4EF6;&#xFF0C;&#x5B83;&#x8F93;&#x51FA;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;<code>area</code>&#x548C;<code>circumference</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// circle.js</span>

<span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">area</span>(<span class="hljs-params">radius</span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-built_in">Math</span>.PI * radius * radius;
}

<span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">circumference</span>(<span class="hljs-params">radius</span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-number">2</span> * <span class="hljs-built_in">Math</span>.PI * radius;
}
</code></pre>
<p>&#x73B0;&#x5728;&#xFF0C;&#x52A0;&#x8F7D;&#x8FD9;&#x4E2A;&#x6A21;&#x5757;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// main.js</span>

<span class="hljs-keyword">import</span> { area, circumference } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./circle&apos;</span>;

<span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x5706;&#x9762;&#x79EF;&#xFF1A;&apos;</span> + area(<span class="hljs-number">4</span>));
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x5706;&#x5468;&#x957F;&#xFF1A;&apos;</span> + circumference(<span class="hljs-number">14</span>));
</code></pre>
<p>&#x4E0A;&#x9762;&#x5199;&#x6CD5;&#x662F;&#x9010;&#x4E00;&#x6307;&#x5B9A;&#x8981;&#x52A0;&#x8F7D;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x6574;&#x4F53;&#x52A0;&#x8F7D;&#x7684;&#x5199;&#x6CD5;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> * <span class="hljs-keyword">as</span> circle <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./circle&apos;</span>;

<span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x5706;&#x9762;&#x79EF;&#xFF1A;&apos;</span> + circle.area(<span class="hljs-number">4</span>));
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x5706;&#x5468;&#x957F;&#xFF1A;&apos;</span> + circle.circumference(<span class="hljs-number">14</span>));
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x6A21;&#x5757;&#x6574;&#x4F53;&#x52A0;&#x8F7D;&#x6240;&#x5728;&#x7684;&#x90A3;&#x4E2A;&#x5BF9;&#x8C61;&#xFF08;&#x4E0A;&#x4F8B;&#x662F;<code>circle</code>&#xFF09;&#xFF0C;&#x5E94;&#x8BE5;&#x662F;&#x53EF;&#x4EE5;&#x9759;&#x6001;&#x5206;&#x6790;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x4E0D;&#x5141;&#x8BB8;&#x8FD0;&#x884C;&#x65F6;&#x6539;&#x53D8;&#x3002;&#x4E0B;&#x9762;&#x7684;&#x5199;&#x6CD5;&#x90FD;&#x662F;&#x4E0D;&#x5141;&#x8BB8;&#x7684;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> * <span class="hljs-keyword">as</span> circle <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./circle&apos;</span>;

<span class="hljs-comment">// &#x4E0B;&#x9762;&#x4E24;&#x884C;&#x90FD;&#x662F;&#x4E0D;&#x5141;&#x8BB8;&#x7684;</span>
circle.foo = <span class="hljs-string">&apos;hello&apos;</span>;
circle.area = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{};
</code></pre>
<h3 id="export-default&#x547D;&#x4EE4;">export default&#x547D;&#x4EE4;</h3>
<p>&#x4ECE;&#x524D;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#xFF0C;&#x4F7F;&#x7528;<code>import</code>&#x547D;&#x4EE4;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x7528;&#x6237;&#x9700;&#x8981;&#x77E5;&#x9053;&#x6240;&#x8981;&#x52A0;&#x8F7D;&#x7684;&#x53D8;&#x91CF;&#x540D;&#x6216;&#x51FD;&#x6570;&#x540D;&#xFF0C;&#x5426;&#x5219;&#x65E0;&#x6CD5;&#x52A0;&#x8F7D;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x7528;&#x6237;&#x80AF;&#x5B9A;&#x5E0C;&#x671B;&#x5FEB;&#x901F;&#x4E0A;&#x624B;&#xFF0C;&#x672A;&#x5FC5;&#x613F;&#x610F;&#x9605;&#x8BFB;&#x6587;&#x6863;&#xFF0C;&#x53BB;&#x4E86;&#x89E3;&#x6A21;&#x5757;&#x6709;&#x54EA;&#x4E9B;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x7ED9;&#x7528;&#x6237;&#x63D0;&#x4F9B;&#x65B9;&#x4FBF;&#xFF0C;&#x8BA9;&#x4ED6;&#x4EEC;&#x4E0D;&#x7528;&#x9605;&#x8BFB;&#x6587;&#x6863;&#x5C31;&#x80FD;&#x52A0;&#x8F7D;&#x6A21;&#x5757;&#xFF0C;&#x5C31;&#x8981;&#x7528;&#x5230;<code>export default</code>&#x547D;&#x4EE4;&#xFF0C;&#x4E3A;&#x6A21;&#x5757;&#x6307;&#x5B9A;&#x9ED8;&#x8BA4;&#x8F93;&#x51FA;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// export-default.js</span>
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;foo&apos;</span>);
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x662F;&#x4E00;&#x4E2A;&#x6A21;&#x5757;&#x6587;&#x4EF6;<code>export-default.js</code>&#xFF0C;&#x5B83;&#x7684;&#x9ED8;&#x8BA4;&#x8F93;&#x51FA;&#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x5176;&#x4ED6;&#x6A21;&#x5757;&#x52A0;&#x8F7D;&#x8BE5;&#x6A21;&#x5757;&#x65F6;&#xFF0C;<code>import</code>&#x547D;&#x4EE4;&#x53EF;&#x4EE5;&#x4E3A;&#x8BE5;&#x533F;&#x540D;&#x51FD;&#x6570;&#x6307;&#x5B9A;&#x4EFB;&#x610F;&#x540D;&#x5B57;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// import-default.js</span>
<span class="hljs-keyword">import</span> customName <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./export-default&apos;</span>;
customName(); <span class="hljs-comment">// &apos;foo&apos;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;<code>import</code>&#x547D;&#x4EE4;&#xFF0C;&#x53EF;&#x4EE5;&#x7528;&#x4EFB;&#x610F;&#x540D;&#x79F0;&#x6307;&#x5411;<code>export-default.js</code>&#x8F93;&#x51FA;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x8FD9;&#x65F6;&#x5C31;&#x4E0D;&#x9700;&#x8981;&#x77E5;&#x9053;&#x539F;&#x6A21;&#x5757;&#x8F93;&#x51FA;&#x7684;&#x51FD;&#x6570;&#x540D;&#x3002;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x8FD9;&#x65F6;<code>import</code>&#x547D;&#x4EE4;&#x540E;&#x9762;&#xFF0C;&#x4E0D;&#x4F7F;&#x7528;&#x5927;&#x62EC;&#x53F7;&#x3002;</p>
<p><code>export default</code>&#x547D;&#x4EE4;&#x7528;&#x5728;&#x975E;&#x533F;&#x540D;&#x51FD;&#x6570;&#x524D;&#xFF0C;&#x4E5F;&#x662F;&#x53EF;&#x4EE5;&#x7684;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// export-default.js</span>
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">foo</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;foo&apos;</span>);
}

<span class="hljs-comment">// &#x6216;&#x8005;&#x5199;&#x6210;</span>

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">foo</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;foo&apos;</span>);
}

<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> foo;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>foo</code>&#x51FD;&#x6570;&#x7684;&#x51FD;&#x6570;&#x540D;<code>foo</code>&#xFF0C;&#x5728;&#x6A21;&#x5757;&#x5916;&#x90E8;&#x662F;&#x65E0;&#x6548;&#x7684;&#x3002;&#x52A0;&#x8F7D;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x89C6;&#x540C;&#x533F;&#x540D;&#x51FD;&#x6570;&#x52A0;&#x8F7D;&#x3002;</p>
<p><code>export default</code>&#x547D;&#x4EE4;&#x7528;&#x4E8E;&#x6307;&#x5B9A;&#x6A21;&#x5757;&#x7684;&#x9ED8;&#x8BA4;&#x8F93;&#x51FA;&#x3002;&#x663E;&#x7136;&#xFF0C;&#x4E00;&#x4E2A;&#x6A21;&#x5757;&#x53EA;&#x80FD;&#x6709;&#x4E00;&#x4E2A;&#x9ED8;&#x8BA4;&#x8F93;&#x51FA;&#xFF0C;&#x56E0;&#x6B64;<code>export default</code>&#x547D;&#x4EE4;&#x53EA;&#x80FD;&#x4F7F;&#x7528;&#x4E00;&#x6B21;&#x3002;&#x6240;&#x4EE5;&#xFF0C;import&#x547D;&#x4EE4;&#x540E;&#x9762;&#x624D;&#x4E0D;&#x7528;&#x52A0;&#x5927;&#x62EC;&#x53F7;&#xFF0C;&#x56E0;&#x4E3A;&#x53EA;&#x53EF;&#x80FD;&#x552F;&#x4E00;&#x5BF9;&#x5E94;<code>export default</code>&#x547D;&#x4EE4;&#x3002;</p>
<p>&#x672C;&#x8D28;&#x4E0A;&#xFF0C;<code>export default</code>&#x5C31;&#x662F;&#x8F93;&#x51FA;&#x4E00;&#x4E2A;&#x53EB;&#x505A;<code>default</code>&#x7684;&#x53D8;&#x91CF;&#x6216;&#x65B9;&#x6CD5;&#xFF0C;&#x7136;&#x540E;&#x7CFB;&#x7EDF;&#x5141;&#x8BB8;&#x4F60;&#x4E3A;&#x5B83;&#x53D6;&#x4EFB;&#x610F;&#x540D;&#x5B57;&#x3002;</p>
<p>&#x6B63;&#x662F;&#x56E0;&#x4E3A;<code>export default</code>&#x547D;&#x4EE4;&#x5176;&#x5B9E;&#x53EA;&#x662F;&#x8F93;&#x51FA;&#x4E00;&#x4E2A;&#x53EB;&#x505A;<code>default</code>&#x7684;&#x53D8;&#x91CF;&#xFF0C;&#x6240;&#x4EE5;&#x5B83;&#x540E;&#x9762;&#x4E0D;&#x80FD;&#x8DDF;&#x53D8;&#x91CF;&#x58F0;&#x660E;&#x8BED;&#x53E5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x6B63;&#x786E;</span>
<span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> a = <span class="hljs-number">1</span>;

<span class="hljs-comment">// &#x6B63;&#x786E;</span>
<span class="hljs-keyword">var</span> a = <span class="hljs-number">1</span>;
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> a;

<span class="hljs-comment">// &#x9519;&#x8BEF;</span>
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-keyword">var</span> a = <span class="hljs-number">1</span>;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>export default a</code>&#x7684;&#x542B;&#x4E49;&#x662F;&#x5C06;&#x53D8;&#x91CF;<code>a</code>&#x7684;&#x503C;&#x8D4B;&#x7ED9;&#x53D8;&#x91CF;<code>default</code>&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x6700;&#x540E;&#x4E00;&#x79CD;&#x5199;&#x6CD5;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>

                                
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